Spring system of spring hammers



. W. WALLIN SPRING SYSTEM OF SPRING HAMMERS File Dec. 16. 1921 a sheets-sheen 1 fl.IGZH /ZLILE Amufze; 1924. 1,492,056

A. W. WALL|N SPRING SYSTEM OF SPRING HAMMERS Filed 60- 16 1921 s Sheets-Sheet 2 I April 29 1924.

'A. W.. WALLIN SPRING SYSTEM OF SPRING HAMMERS led ne. 16. 1921 s Sheets-Sheet a operation of the hammer.

Patented Apr. 29, I924.

ANDERS "WILHELM W'ALLIN, OFKLAERESTROM, SWEDEN, A3SIGNOR E AKTIEBOLA- GET KLAFREST'RMS BRUK, O'E KLAFRESTROM, SWEDEN, A COR'EORATION.

srnnve SYSTEM or srnrne Harrnrnns.

Application filed December 16, 1921. Serial No. 522,945.

T 0 aZln/aiiom z'tmay concern:

Be it known that I, ANnEns NILHELM VVALLIN, chief engineer, a subject of the King of Sweden, residing atKlafrestrom,

a Sweden, have invented certainnew and useful Improvements in the Springv Systemsof Spring Hammers, of which the following is a specification.

In spring hammers, the hammer arm gen- 1 erally consists of two parts pivoted each to a common axle, one of such parts being actuated partly from above by a spring system, through the intermediary of a presser arm, and partly from below by another spring system. p

In the constructions of the said description as heretofore known, the upper spring system iseither bearing on the presser "arm of the hammer so as to slide thereon with friction, or it is rigidly connected with the latter.

. In these arrangements, however, there will be either a considerable wear of the friction surfaces with a useless expenditure ofpower attending same, or,in the other case, where a rigid connection is employed between the spring system and the presser arm, the spring system is strained by tensions which, to a certain eXtent,.-counteract theproper In the onev case aswell as in the other, the efiiciency of the machine is materially decreased.

With respect to the arrangement of the spring system actuating the hammer arm from below, the prior'cons'tructions again suffer from the disadvantage that it is not possible to impart so great a resiliency to the spring underneath the hammer arm that it will bear against said arm when the two parts thereof form an angle'between them. The spring wouldbe either too soft to carry the load of the hammer head, or it would have to be strained so much as to make the whole system stifi. Therefore, on the ham-' mer armassuming a certain. position, the contact between the spring and the hammer arm would be interrupted, which would result in blows and cracks with an injurious influence on the efficiency of the machine, or evenin breaking of the springs. Many endeavours have be'en'made'toavoid. these drawbacks but without'any favourable result. I

According to the; present invention, which at has for its purpose to remove the said drawbacks, the upper spring system is movably arranged 'on the presser arm through the intermediary of a friction roller or the like' hammer arm and the slide bar, so as to act on the lower. side of the hammer arm.

The invention is illustrated by way of example in the accompanying drawing in which, Fig. 1 is a side elevation of one embodiment, the said figure representing the upper portion of a hammer arranged accord- I ing to the invention, whereasI igs. 2 and 3, which are drawn to a largerscale, show a detail, partly in section, and viewed ineach of these figures at right angles to the other.

Fig. 4 shows the arrangement of aspring device according to" the invention, and

Fig. 5 is an assembly view of the entire hammer construction. I

lhe hammer arm consists in known man ner of two parts 1 and 2 pivoted each to a common axle 3, carrying the hammer head 27, while part 2 serves to receive the power and conveys it to part 1 through the intermediary of, springs. The presser arm 4:, pivoted as at 10 and actuated by the spring system 5, is provided with a friction roller 7 or the like having resting thereon a plate 8 preferably made of steel. This plate 8 is provided at thelower side thereof with-a cup-shaped recess 9 engaging the roller 7, and carries on top thereof the spring system-'5, the upper portion of which is held firmly by the'clam'ping bolts 11 supported bythe stay members 11 Thepresser arm a is guided laterally by thebosses 6 arranged on the one part 1 of the hammer arm.

By this arrangement, the. compressing force of the spring system 5 may at. all times act substantially in one and the same direction, that is to say in parallel with the tension bolts 11, while strains that would impede the proper working of the hammer are entirely avoided, in that the lower part movable. connection with the presser T3/II11,.lO

-tions of the hammer arm, the frictio'nroller- 7. will. then assnme difl'erent positionsin the.

and frointhe longitudinal direction therer of. .According to the varlous angular-posicup-shaped recess9, as will, be-clearly seen from Fig. 2, where the relative position of the parts in the one end position of 'the ham mer is shown by full lines, whereas the relative position of the parts .in anotherposition ofthe hammer is shown by dot-and-dash linesJ- v I,

Thespring device acting on the lower' side oftheha'mmer armconsists of an arm 12 which is pivotallymounted on a stud'l3 in a bracket 17 between the rear: partr'2ofthe hammer arm'and the bar 14, which is integral with" the bracket l'i', and serves as :an

attachment for; the small end of a connecting rod 26 (Fig. 5") by means of which power is applied to the hammer. In the embodiment shown, thesaidarm 12 i is ac tuated' by aspring system 15 compressed between the part" 2 and a plate 16" carried by the arm 12'by means of a sphe'ricaljoint: The spring system-15","which is shown in detail in Fig; 4', comprises two helical springs 18 "and-1'9; the spring; 19 being guided on thestud 21 1 inside the spring pas ing; 20,! whereaspthe spring '18 is mounted on-the ontside-ofsaid spring-casing. The

' spring 18 isrestingwithits-one end on=the projecting flange 241-,andwith its-otherend bearsagainst' the bottom of a recess in the member 2'. The spring'19 bears-with its one end against the plate 22'provided-with the spherical projection 23 resting in the socket 24: of the joint 23, 24, while the opposite end 7 of spring 19 bears against-the bottom of the spring casing-20.

The'onter spring- 19 isvery long and'soft, and it consequently has a greatresiliency even on a small load. The object of this spring-isto always keep the fore end ofth'e arm 12 pressed against the hammer arm. When the hammer is in rest'and thehead of the hammer isdependingfreely, the spring ate the shock' resulting when, on its down.

18' is wholly; com'pressedi On the other hand,qthe"inner spring 19 isshort and stiff with avery'little resiliency evenon'a great load. The object ofspring 19is to m0der stroke, the hammerhead is again jerked upwards? 'Through this" arrangement, the compression: and--ex-tensi-on ofthespring will alwaystake place at. right angles to the ends of the spring,independently of the de flection ci -the arm-inmotion. The spring a relative position of thetwoiparts;

may be -given suchQa strength. and length that-it will alwayskeep the opposite end of the arm 12 pressed against the'fore partjl of the hammer'arm, independently of the There are no parts subjected to" friction,

nor do-any' undesirable strains set'in that would impede: the properpperation otth'e hammer, but the whole system isacting softly and with ease, and with a much higher efficiency than the hammers of previonsly known constructions, ashas been found by practical tests.

' .What I claim as net by Letters Patent of the lllnited States is 1. A spring hammer comprising in combination, altwo-member hammer arm, each member being pivoted onto a common axle,

a spring system acting on one" side of the.

one member of thehammer" arm through: the

and" desire to secure intermediary of a 'presserarm arranged? betweenthe said spring system and thesaid member of the hammer arm, and an antifrictional; member interposed between the said spring system and the said presser arm, makingthe connection between spring systemand pressersarm movable".

2.* A; spring hammertcomprisiirg in com+ bina'tion; a: two member'hammer arm, each member 'being pivoted onto a commonaxle, a spring. system I actingon one! side: or, the

one member of the hammeraarm through' the intermediary of a presser: arm. ar-

ranged between the said 1 springssystem :and thesaidjmember of the hammerfarm; and a friction roller interposedbetweenithesarid spring} system and the: said 'presser arm;

member of the I hammer arm, anj antifrie tional member interposed between the said spring system-and the said presser arm;

making the connection between spring vsystem and presser arm movable, and": a

second spring-actuated presser arm acting on the opposite- :si'deof "thehammer arm,

said spring-actuated presser' armbeing pivotally mounted between the ha'mmeriarm and the 1 connecting 1 member for the power transmitting means;

5. A; spring hammer COTIIPIISHIg' fiII com-i binat-ion, a two member hammerarm'; each member-:being pivoted'onto =a commonaxle,

a spring system-acting 'on" one-side of the one member of the hammer arm thronghthe intermediary of a presser'i' arm arranged between the said I spring system and the said member of'the hammerarm, an*antifrictional member interposed betweenthe;

sai-d'spring system and thesaid 'presserarm, making the connection between-springsystemand presser arm movable and asecond spring actuated presser arm acting on the opposite side of the hammer arm, a helical sprin device being disposedbetween the rear en of the said second presser arm and the rear portion of the hammer arm, said spring device bearing against a plate supported on the said presser arm by means of a spherical joint. I

6. A spring hammer comprising in combination, a two-member hammer arm, each member being pivoted onto a common axle, a spring system acting on one side of the one member of the hammer arm through the intermediary of a presser arm arranged between the said spring system and the said member of the hammer arm, an antifric tional member interposed between the said spring system and the said presser arm, making the connection between spring system and presser arm movable, and a second presser arm acting on the opposite .side of the hammer arm by means of a spring device consisting of two helical springs disposed within each other, and adapted to be compressed together through the medium of a casing, the bottom of which bears against one end of the one spring, while a flange of the said casing serves as a support for one end of the other spring.

In testimony whereof I afiix my signature in presence of two witnesses.

ANDERS WILHELM WALLIN. Witnesses:

, B. H. BUGROLH, K. E. WIBERG. 

